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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917c38f6f38cfe49f10c13e3e633041d862e9f9f86fad1f16e8392406975f1ed' 
  AND token = 'cTg8Go6N339zKbR2Vvb03w6kH+6LgCa7EumQwLcxB60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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