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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af4f6f0abf1b9f19336eceb9443ece5ec5594f8539cef51bd88b0afe3063a55' 
  AND token = 'dPFS+/MbS+b00EnNsriW7Uxtm4KKrk+3dphzWJxxGmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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