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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b927355eed3b7fb0b616c89f14095f3b631e1d0ef95b51cfe237f3b495e541f' 
  AND token = 'gRJF90rx0N8vNpAJihP41Sk2eruBpr+33orRLjvOzGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}