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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6968bfcdc3234be5c737815f315d97053699e2f32dba0a9c05c010e3c4d89c' 
  AND token = 'RNfx1Hg+ZWkZgPXuzMZ4gykiADBzw4DF9/N2Qo4rBkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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