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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b120779ec1ccf3b046fa105a709cd37a763d66d2c2063f8d08b8e88dcb2278' 
  AND token = '4ezaoTHoil7b/lIrptRXwq5SVCZLNY24e2QNODTZCu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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