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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e160ecdce8c9ae56dd856473d6c803b0fe257fd4cf7d6c56807b96b0ff231f9' 
  AND token = 'X4z691Cx6JCJP0/vCiHKSybzl5OTHOflL73jjSPr6rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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