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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01761528f436375d12fc51f88d22b5404f2736fa58de89e2e1a844f3b125876' 
  AND token = 'AUfvsWm6DNceRIiHhRRI9MQ/HWD//61Phtc7SY/AZfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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