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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed1d0f401f8eb9e8585c5bde36a43afe773782970432f9382c78be8a8e4923f' 
  AND token = 'r4y/Lq+qTkqoGk8HSGdewBQNVbIOIKMOg625z3LOWl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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