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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab9ecb37d93b67e7d9db8c81ccc41f74a133fe5624e4b4c6154caa53fbc4412' 
  AND token = 'zR4flqiWf7ZXcdrpr1T0CN86Em60fwHwCeqmIAxHemA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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