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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ef2a6a478fa6b57c12e699911fd088bda52570940d294f0bcc7fd89bb2e9ed' 
  AND token = '6l3chDD2ncCRZn35zQu4jo0p3AqZB1kVDrsP9K8n8aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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