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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55d8b4c9cc54ffab2f7e1a1bb659874d66fb4f886a8694936c590a0836746e0' 
  AND token = 'eyKFqXd9L93DJnsKAZk20hmDtKJvmDydo9zoZSueViU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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