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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '937c1508e7fb0d0de96634861ab734d59c94f73f287848627e75fd0484b7e02f' 
  AND token = '9b7f1QeXC0qm+0+t2iHXSnNBD+MuDWu1W6WjLZS5T/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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