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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b705817656827bcfa4a134982a9e377de96ec98166c3635bddbe0cc2afd79e70' 
  AND token = 'XDY9T8+6J+woCRPZ0Ee9WeTJX3/Q3qC534J2gd+FA5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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