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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27881e51b6824ad7b5bfa3b02b9212003d869acbf0315b3571cb8e7bdc145e32' 
  AND token = 'zx2ueLwzpyDOTWz6hEMhG5C2ijAcdZkVbNGs1Pv/kh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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