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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0be3c5116034ad1abe25a94e27e67d4fa2f9a93ffe0e9b1840cfa58e422a2a' 
  AND token = '4Mri6og6T7ytf67y96hqYxb2Z0X4/IhQLd2y0uLJt10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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