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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4faf7ad0dc65da110ddd8d505080034a63433cd644d25213d28cd6899a0adbb0' 
  AND token = '4ZOtwggS4ETXpwzR2dssTG70d85Cp0aXwOBRBmx32UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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