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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680da6b96ebb8cbb765a576a5430e9c40473207a7c128fda7d28f7c9321ca6cc' 
  AND token = 'fRTEGEMa3ssWbQX3NeHc9Qhw5dxkGm3IrtFptpAgRnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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