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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cb6db8ed313e13a6868189ab98358a9401109d46369edd818bec4116a814e8' 
  AND token = 'slJpiO8Uz4Wnzf5Iy8ijUhVTi2Llou7983Pxs9IB0fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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