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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635bc6a944811721bfae60c546007b630cb7153855c2082a77f7a31371c2bb0c' 
  AND token = 'q9cyAQyjfd8q5H6LsskixZ7jm7H+7tc6xb01Ccetg28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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