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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3650d809b5d99dcdb179b163c80355cb9539463b0c0e6881e47b783cb8ff7b7' 
  AND token = 'LzVl6x1wm2rffvKUVarBFT3i5UEfCsYfR6oCEUlxu9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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