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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd58cb11cf8c273a9a036a663cde997c3be51991a1f7e7dd931c9a57f1f82f7b' 
  AND token = '554TkHmt0oiNnrJlHLANFZsE37xdGSDxdByJxt77+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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