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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b720097535a349deb3205ce825e52bb568a4e869d1c24d84f4f794eee7fa547' 
  AND token = '6za1pJ+cF+RoPWcBrYMz0To6U5f7cC/1iIFpnxKNrXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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