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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b7daf3aa4dfb1c2e14279d128248043b64802039677027d928daad50a0f92f' 
  AND token = 'OriBSjE8O97DPAA4yUPirweh1XgXIWOCMPcqEQOx0zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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