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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2ea5ba162e2aef35c96ff150a919ea6ac60d2e1b67c3491e7c50ee9919ecb1' 
  AND token = '8rnm4PMZVHfQaZm6SBAqxjzEnCQuSWST7qmiSmm6U+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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