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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd65b432eebe49e85d8dee0217601e84959bb74a0b2f9a0301570bfbee8e86e' 
  AND token = 'oEe3VYBClCPKC0NIvrqCmmfXkGJz550mqwScg5beEmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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