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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba4a56154aae0f6367fac09f3d8e7261ee84b25a6f8267b3f02ada84b2dd5d7' 
  AND token = 'GaOOf7Bf4H01G0TYhYQ1zoTEV+Jpl/7flUj7C0fC/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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