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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8644367429bf85b2dcd0ef7de9912f4aee42422758f882e5b86ffef319dc82c' 
  AND token = 'oP1V+dLvAT+efJtj9FaMJ9gL+8+68O/LSOM7/nzHC5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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