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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6322b19e469b5921f3aa380c91875610dd6587e40ac275703549112af5bc9d5d' 
  AND token = 'GjMiom78IkjQ/b95sHAINOgPPShXrbWlEglTZYUYWAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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