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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdafb20a27235f8402a005f6d62b58834cb41c0c7524f8a072039b09c720a1a3' 
  AND token = 'PTCjNSB2PCXh+nIonsLnIUX6Ik7bWYVA7lvlyUCuks0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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