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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8341fff810ae54c401270e48415b87726ef69dfb6497c88d4ef17e067be0160' 
  AND token = 'hObWFoQOcbZgHj2C3I0GExIcfZsqd7VUYld73Bo488I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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