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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbaee5f03ea1bde361ecd3060e3a1cf825e9ddbe7fcf53c40db7d514e6e9c88' 
  AND token = '+d0DEK8kpj4JpfwcN83ZMI3j8/qToZidm0D6BYnHqaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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