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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9370037a83173a3ca2d94265f754bd2c03f2a2d5a30143668af845d6da2c8a' 
  AND token = 'SiTV3dackHGgczR323LLkYLUeBB9eW/86vqdI4UA1xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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