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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc692fc3b8b1750c1cc89c5a9da17de0010c6f7800c7f7c16fe4d0571882986a' 
  AND token = 'DUUeFgdQC2zUu5Hj4vrM7Ny5xrVphc++qYyzQyOoXb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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