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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc050e74750463e987d69b69472a7eceef58d1dc899194b7825d67646086ae6' 
  AND token = '0oV0u8eFFsUPyypQCSr9iuB5WHmAQC8cWn2VhU3iVw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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