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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7593efdd93cb7f1e33b46d25ebcf21a0c101f853267b691bb5356f69e8c9ef' 
  AND token = 'zlRALKwlb43zR6lweCGDen4qSulD3OTx2KEQSMuuYvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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