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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '456522fefebc7ab2ca7b3406f69801359d5130dbdf97208ca0e25b7d771c08f3' 
  AND token = 'Q4AegwXm25E8LF2crh1eFukAKDSGvktvHO7XeeqwSHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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