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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8556b9ba6688022621e9cc576cf11078ef035d6ab05dd8e79c51b912cc67b239' 
  AND token = 'lCLy0auePopUi9fd0ub5hwFz7FecoCUHTPrTRxfYC9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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