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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c2dc9a229e0651aff33c5808bf79a7904cc33f1a55c879fe879cce252ce284' 
  AND token = 'JV7vckTNOQbdiLC4U6Wd6CYdGm+IcDgoL8PqVM7YGuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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