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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47eeb99439d27edb7d4de699bc90952d8526b9f65229e68591cf3d3617f8609' 
  AND token = 'rbbG1M1ZyVleYAiX1Duj9eotBqIKwu3/u2hwzb2A1ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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