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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c89044c4e60b98975d2ff7c8838212514d12da0f0ba4b5d52b41aa7064e38a' 
  AND token = 'FRnVxY2MEWg6TRpqZ3/cxtn4Ywc6jFBE0r/a+akmgnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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