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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4fcd5108361170f9d1b2815467fd7ff8a337465582acc5159578d1d842ec3d' 
  AND token = 'DRIZ66Xhkc0sva/Cr7d8K7opxKm2vA4RQtyU9jKkDXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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