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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01f09b0b0673cafdca1f0fbc9cc9a80e12f88d0f899c47365b35c30b7f0d803' 
  AND token = 'Hiv9ZOY74ExrZ6CNxf9O6X/XqfFnXNv3RpuGr6dxEow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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