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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0890bcb40c9dc9b2a3d5313bfa4a3f867e19b29bd759f7ef6c25ce58bc6ddfaa' 
  AND token = 'oEfqJBB990NUHy2ArQ+uEs22QSXhZcM2rivn6P6D/DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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