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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82818a62f02b3ed600b78e7685619264d20e1bd95198031bba6943005654c3c4' 
  AND token = '0TP0IcbBK5Rdnh+ve1t6ICtyhllNx9fLuakiVT20odc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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