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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c5da68f8fd82d6cdd7e7a1b3a7ba5a929ecf83df84a6e6b384bec186902f1d' 
  AND token = 'bbCJs2Kn3QpZnG5RXe1+asrAdzdvy4KoFYyrp3cf5Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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