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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882337d4ea9c53feceb9a8ee942688911440472a3f178964573ba423c845d6d3' 
  AND token = 'StI3wUquEs+vuD0Z8KPyYB8uQy1uCGLmbDL0pq82x+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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