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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b057e0bbc2c87e9e38d48fca5540cc43e0f13a30ea7d8d4d1081cce02b721b25' 
  AND token = 'fB2aKvHdmG6zPObhlplC2T3IazbA3PILpyjNob2l+WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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