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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34110f3e2c5ba81b20379564bfd62f638b9430c1b75ef1a2ee2cb0f6b796efbf' 
  AND token = 'U0AAiDf87oZFROeZyVGqgh8Pv21Et4L2m3cNlSx1Lr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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