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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f005f41c5079c5bfd7bd7f589209eec32d11170bf166587f3e1ed4d4125b3ee1' 
  AND token = 'G7L+BfWJiE17DJOazLIdC4zL8TnYTvdh0ag4Oa90oEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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