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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cab13393d3a5fb1ed5fc8627edad492086369bd90c0e4af33ed09de15e259b' 
  AND token = '2SaMJWNCx7BimZ42885HmSlKBsNTaLbp2/y35SAD39k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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