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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8420619c17dc424918e8ed737659ba6f0420d0d22d576e9f74a1577461343dc5' 
  AND token = 'CB8fQCDW24CTTs7cEnvmWxageX1DsOf6vg8qePtjAfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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