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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f3b319a8c6bc88aab733ce367b7846b86c1b310599f44879a07d0197bc219d' 
  AND token = 'JGClHQBErcNWKCPgC1dHpeAzQnaXDz5PODVbQfnb/8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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