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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b2a8ae1d2f97f2aaa52de0ac6697f64ec228f8431734bc798b5e91abc83deb5' 
  AND token = '7yq9HE2hBeRf0Pwd2v8g+4wHsn2+g5U0d7hqNH1Q4rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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