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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f29a339b10612947e5a0ff23bbe9d35ad9a99ee90655563c0cd96e50dcc16241' 
  AND token = 'BFqnEpVjoAjfaody9kW/zXuirT2FLiLU6C2CZ588cms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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