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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0877bcf62d2c4c4f636ce1be58ef9c6f3161c627a5228c06a7305199c5058962' 
  AND token = 'urtU76Kido7feBpXIUxAmD8U++Zbt0o2jGn2KKP6PWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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