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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac98227013e19978a05016fb76c9caa92ce63bc6587e0b83e8d9c73eae080400' 
  AND token = '6cKQbipyFj3pbAA2wB0WcrVzptpQ1nd1V+Cm5g6c+ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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